US20060030247A1 - Cleaning sheet and method for a probe - Google Patents
Cleaning sheet and method for a probe Download PDFInfo
- Publication number
- US20060030247A1 US20060030247A1 US11/218,932 US21893205A US2006030247A1 US 20060030247 A1 US20060030247 A1 US 20060030247A1 US 21893205 A US21893205 A US 21893205A US 2006030247 A1 US2006030247 A1 US 2006030247A1
- Authority
- US
- United States
- Prior art keywords
- paint
- foamed layer
- probe
- layer
- abrading particles
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/06—Measuring leads; Measuring probes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B29/00—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents
- B24B29/02—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents designed for particular workpieces
- B24B29/06—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents designed for particular workpieces for elongated workpieces having uniform cross-section in one main direction
- B24B29/08—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents designed for particular workpieces for elongated workpieces having uniform cross-section in one main direction the cross-section being circular, e.g. tubes, wires, needles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B1/00—Cleaning by methods involving the use of tools, brushes, or analogous members
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
- B24B19/16—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding sharp-pointed workpieces, e.g. needles, pens, fish hooks, tweezers or record player styli
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D15/00—Hand tools or other devices for non-rotary grinding, polishing, or stropping
- B24D15/04—Hand tools or other devices for non-rotary grinding, polishing, or stropping resilient; with resiliently-mounted operative surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
- B24D3/20—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially organic
- B24D3/28—Resins or natural or synthetic macromolecular compounds
- B24D3/32—Resins or natural or synthetic macromolecular compounds for porous or cellular structure
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R3/00—Apparatus or processes specially adapted for the manufacture or maintenance of measuring instruments, e.g. of probe tips
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/06—Measuring leads; Measuring probes
- G01R1/067—Measuring probes
- G01R1/06711—Probe needles; Cantilever beams; "Bump" contacts; Replaceable probe pins
Abstract
A cleaning sheet has a base sheet, a foamed layer of a porous material on the base sheet and a polishing layer formed on the foamed layer. The foamed layer includes non-fibrous abrading particles and air bubbles. Such a cleaning sheet may be produced by preparing a paint having air bubbles dispersed inside by mechanically foaming a foaming material containing a foaming resin material and abrading particles, forming on the base sheet a foamed layer having abrading particles dispersed inside by coating a surface of the base sheet with this paint and drying it, and forming a polishing layer on the foamed layer. A probe having a tip may be cleaned with such a cleaning sheet by causing a surface of its polishing layer to be pressed against the tip of the probe and causing the tip of the probe to penetrate the polishing layer and further to be inserted into the foamed layer having abrading particles dispersed inside.
Description
- This is a continuation-in-part of application Ser. No. 10/298,310 filed Nov. 14, 2002, now pending.
- This invention relates to a cleaning sheet for and a method of removing foreign substances attached to the tip and side surfaces of a probe used for inspecting a planar target object such as a semiconductor device having integrated circuits installed thereon.
- Chips are produced by installing semiconductor elements and integrated circuits on a semiconductor wafer through various wafer-producing processes. The chips thus produced on a semiconductor wafer are cut off from the wafer after a current-passing test and are packaged. Tests with a current are carried out also before and after the packaging to separate faulty products stringently from qualified products.
- Such current-passing tests are carried out by means of a test apparatus of a known kind such as a wafer prober. A position-matching process by moving a prober needle (“probe”) serving as an electrode of a tester and the electrodes on the chip (pads or lead lines) and a contacting process between the probe and the chip electrodes are repeated for carrying out electrical measurements of different kinds.
- While such position-matching and contacting processes are repeated by moving the probe and the electrodes on the chips, the tip of the probe slides over the electrodes on the chips, scraping off portions of the electrodes. Such portions of the electrodes that have been scraped off become attached to the tip and the side surfaces of the probe as foreign substances.
- The foreign substances, that thus become attached to the probe, are metals such as aluminum. If such a metal is oxidized, the electrical contact resistance between the probe and the electrodes on the chip becomes larger, making it impossible to carry out accurate electrical measurements. Thus, it is necessary to clean the tip portion of the probe regularly after each time a specified number of contact processes have been carried out in order to remove such foreign substances from the probe.
- Removal of such foreign substances from the tip portion of a probe is carried out by using the same apparatus used for the current-passing tests such as the aforementioned wafer prober, except the target object to be tested such as a semiconductor wafer attached to the apparatus is replaced with a cleaning device having a similar shape. Examples of a prior art cleaning device of this kind include hard polishing plates of a grinding stone, glass and a ceramic material (as disclosed, for example, in Japanese Patent Publications Tokkai 7-199141, 5-209896, 5-166893, 4-96342 and 3-105940) and sheets with a polishing layer formed on an uneven surface of an elastic member having protrusions and indentations (as disclosed, for example, in Japanese Patent Publication Tokkai 2000-332069). The probe is pressed against the surface of such a cleaning device, as done in the aforementioned current-passing test.
- If a polishing plate of a hard material is used as the cleaning device and the probe is pressed too hard against it, its tip portion will become deformed and hence it is necessary to reduce the pressure with which the probe can be pressed against the cleaning device. As a result, only the portions very close to the tip can be cleaned. If a cleaning device of the type with a polishing layer formed on an elastic member is used, on the other hand, the tip of the probe penetrates the polishing layer and cannot be cleaned sufficiently. Thus, the common practice has been to provide separately a device for cleaning the tip and another device for cleaning the side surfaces, attaching them to a current-passing test apparatus consecutively one at a time. It was therefore both cumbersome and time-consuming to clean a probe.
- It is therefore an object of this invention in view of the above to provide a cleaning sheet capable of cleaning both the tip and the side surfaces of a probe, a method of producing such a sheet and also a method of cleaning a probe.
- A cleaning sheet embodying this invention, with which the above and other objects can be accomplished, may be characterized as comprising a base sheet, a foamed layer of a porous material which is formed on the base sheet and includes non-fibrous abrading particles and air bubbles, and a polishing layer formed on the foamed layer.
- Such a cleaning sheet may be produced by preparing a paint having air bubbles dispersed therein by mechanically foaming a foaming material comprising a foaming resin material and abrading particles, forming on a base sheet a foamed layer having abrading particles dispersed inside by coating a surface of the base sheet with this paint and drying it, and forming a polishing layer on a surface of the foamed layer.
- Such paint may be produced by sending air into the foaming material while stirring the foaming material and thereby dispersing the air bubbles and the abrading particles inside the paint. Because it is by a mechanical means that the foaming material is caused to be foamed, the abrading particles and the air bubbles can be dispersed uniformed throughout the interior of the foamed layer without strictly maintaining the conditions for the foaming reaction such as the reaction time and temperature.
- A probe having a tip may be cleaned with a cleaning sheet embodying this invention, structured and produced as described above, by causing a surface of its polishing layer to be pressed against the tip of the probe and thereby causing the tip of the probe to penetrate the polishing layer and further to be inserted into the foamed layer having abrading particles dispersed inside. As the tip penetrates the polishing layer and becomes inserted into the foamed layer having abrading particles dispersed inside, both the tip and the side surfaces of the probe become cleaned not only by the abrading particles inside the polishing layer but also those in the foamed layer.
- In summary, with a cleaning sheet thus structured and/or produced, the tip and the side surfaces of a probe can be effectively and simultaneously cleaned.
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FIG. 1 is a sectional view of a cleaning sheet embodying this invention when a tip portion of a probe is being cleaned therewith. -
FIG. 2 is a schematic side view of a wafer prober. -
FIG. 2 shows a wafer prober 20 of a known kind. When a cleaning process according to this invention is effected, acleaning sheet 10 embodying this invention to be described below and shown inFIG. 1 is attached to such awafer prober 20 instead of a target object to be inspected such as a semiconductor wafer which is normally attached thereto. As shown inFIG. 1 , thecleaning sheet 10 is comprised of abase sheet 11, afoamed layer 12 formed on a surface of thebase sheet 11 and apolishing layer 13 formed on the surface of thefoamed layer 12. Thefoamed layer 12 is a layer of a porous foamed material containingnon-fibrous abrading particles 14 and many air bubbles inside. Such a cleaning sheet may be produced by first preparing a paint material by mechanically foaming a material including a foaming resin and abrading particle. A surface of thebase sheet 11 is then coated with this paint material and it is dried so as to form thefoamed layer 12 with the abrading particles dispersed therein. Thepolishing layer 13 is thereafter formed on the surface of thisfoamed layer 12. - The foaming material to be used in the production method described above may be obtained by mixing a foaming agent such as a salt of fatty acid, an acrylic thickener, a fluorine or silicon type stabilizer, and also powder of aluminum hydroxide with average diameter of 0.01-70 μm for improving the stabilization effect, and further by mixing in an epoxy cross linking agent. As the
abrading particles 14, particles of aluminum oxide, silicon carbide, chromium oxide, iron oxide, diamond, boron carbide, cerium oxide or silicon oxide with average diameter of 0.01-70 μm are also mixed into the foaming material in an amount of 5-80 weight %. Throughout herein, the expression “particles” is intended to be interpreted in a narrow sense of the word, excluding any small objects that may be referred to as being fibrous or a fiber particle. - The mechanical foaming of the foaming material thus prepared is effected with stirring while sending in air at a specified rate into the foaming material containing the
abrading particles 14. As a result of this process, theabrading particles 14 and theair bubbles 15 become uniformly dispersed inside the foaming material and a paint with a high degree of viscosity containing air bubbles is obtained. The foaming multiplicity of the paint is in the range of 2-5 times. Such a mechanical foaming process may be carried out by using a continuous high-pressure foaming apparatus (such as TW-70 produced by Aikosha Seisakusho of Japan) used for the continuous mixing process of raw cream. - The paint material with air bubbles may be applied on a surface of the
base sheet 11 by a known method and with a known means such as the knife coater method and the so-called direct coating method. A sheet with a flat surface of a plastic material such as polyester and polyethylene terephthalate (PET) may be used as thebase sheet 11. The drying process for the paint applied on thebase sheet 11 may be effected in an environment with temperature in the range of 90° C. -160° C. In order to completely solidify the paint, a far infrared ray may be applied additionally. For forming a stablefoamed layer 12 with abrading particles dispersed on the surface of thebase sheet 11, furthermore, a ventilating means such as a fan may be used to cool it after the foaming paint coated on the surface of thebase sheet 11 is completely dried. After such a drying process, afoamed layer 12 withair bubbles 15 and abradingparticles 14 uniformly dispersed throughout is formed on the surface of thebase sheet 11. The thickness of thefoamed layer 12 thus produced is within the range of 50 μm-200 μm. - Since the
foamed layer 12 according to this invention is formed by a mechanical foaming process rather than by a chemical method, the abrading particles and air bubbles can be uniformly dispersed without the necessity of strictly controlling and maintaining the conditions for the foaming reaction such as the reaction time and the temperature. - The
polishing layer 13 may be formed by preparing a polisher paint having abrading particles dispersed within a resin solution obtained by dissolving a resin binder selected from polyesters and urethanes in a solvent such as methylethyl ketone, applying it on the surface of thefoamed layer 12 by a known method such as the reverse coating method and then drying it. The thickness of thepolishing layer 13 is in the range of 5 μm-30 μm. Particles of silicon carbide, silica, aluminum oxide and diamond with average diameter of 0.001 μm-10 μm may be used as the abrading particles. - A wafer prober such as shown at 20 in
FIG. 2 , commonly used for current-passing tests, may be used for cleaning a probe for inspecting a planar object such as a semiconductor device with integrated circuits installed thereon. As shown inFIG. 2 , thewafer prober 20 has a table 23 on which a target object for inspection such as a semiconductor device is intended to be attached. After such a target object for inspection is attached, the table 23 is moved horizontally and vertically for positioning and the target object is pressed against aprobe 22 of aprobe card 21 in order to carry out electrical measurements of different kinds on the target object. When theprobe 22 is to be cleaned, thecleaning sheet 10 as described above is attached to the table 23, instead of the target object for inspection and the table 23 is similarly moved similarly to press theprobe 22 against the surface of thecleaning sheet 10 attached to the table 23. - The
cleaning sheet 10 may be cut into a circular, quadrangular or any other shape and pasted on the table 23 by means of a double-side adhesive sheet. Alternatively thecleaning sheet 10 may be pasted on a flat plate of an appropriate shape and this plate may then be attached to the table 23. In summary, the manner of attaching thecleaning sheet 10 onto the table 23 does not limit the scope of the invention. - When the tip of the
probe 22 is pressed against the surface of thecleaning sheet 10, it penetrates thepolishing layer 13 as shown inFIG. 1 and is inserted inside the foamedlayer 12 with abrading particles. Both the tip and side surfaces of theprobe 22 are cleaned by the abrading particles in thepolishing layer 13 as theprobe 22 penetrates thepolishing layer 13 and thereafter by the abradingparticles 14 dispersed in the foamedlayer 12. In summary, since both the tip and side surfaces of theprobe 22 are also cleaned by the foamedlayer 12, those of the foreign materials not removed as the probe penetrates thepolishing layer 13 may be expected to be dependably removed inside the foamedlayer 12 from the tip and the side surfaces of theprobe 22. - As a test, a cleaning sheet embodying this invention was produced by adding 2.9 kg of particles of aluminum hydroxide (HM-43 by tradename produced by Dai-Nippon Inki Kagaku Kogyo Corporation) for improving the stabilization effect and 2.9 kg of particles of aluminum oxide (WA8000 by tradename produced by Fujimi Incorporated) to 28 kg of foaming urethane resin (DICFORM F-505EL by tradename produced by Dai-Nippon Inki Kagaku Kogyo Corporation), mixing them together in a pot mill for 96 hours and thereafter producing a foaming material by further adding thereto 8.7 kg of a foaming agent (F-1 by tradename produced by Dai-Nippon Inki Kagaku Kogyo Corporation), 0.29 kg of a stabilizer (NBA-1 by tradename produced by Dai-Nippon Inki Kagaku Kogyo Corporation) and 0.58 kg of a cross linking agent (CATALYST/PA-20 by tradename produced by Dai-Nippon Inki Kagaku Kogyo Corporation), further mixing in 0.87 kg of a hardening agent (DR-5L by tradename produced by Dai-Nippon Inki Kagaku Kogyo Corporation) and 1.45 kg of a thickener (VONCOAT 3750 by tradename produced by Dai-Nippon Inki Kagaku Kogyo Corporation), and producing a paint with air bubbles by foaming this material by using a continuous high-pressure foaming machine (TW-70 by tradename produced by Aikosha Seisakusho). This paint was applied on a polyethylene terephthalate (PET) sheet with thickness of 75 μm running at a rate of 2.0 m/minute by means of a knife coater to a thickness of 400 μm. After it was dried in an environment of 100° C., it was further dried by far infrared irradiation (120° C. and 140° C.) and cooled by means of an ordinary fan for family use to form a foamed layer with dispersed abrading particles on the surface of the PET sheet.
- Next, green carbon particles with average diameter of 1 μm were dispersed in a resin solution obtained by dissolving a urethane resin binder by means of a solvent such as methylethyl ketone to obtain a polishing paint. This polishing paint was applied on the surface of the aforementioned foamed layer by the reverse coating method and then dried to form a polishing layer on the surface of the foamed layer and to thereby produce a cleaning sheet of the test example.
- This cleaning sheet of the test example was used to clean the tip portion of a probe by using a wafer prober as shown in
FIG. 2 by removing the semiconductor device which had been inspected therewith and attaching instead the aforementioned cleaning sheet of the test example. The tip portion of the probe was microscopically observed both before and after the cleaning process and it was ascertained that the metallic foreign substances found to be attached both at the tip and the side surfaces of the probe had been completely removed.
Claims (8)
1. A cleaning sheet comprising:
a base sheet;
a foamed layer formed on said base sheet, said foamed layer having non-fibrous abrading particles dispersed therein; and
a polishing layer formed on said foamed layer.
2. A method of producing a cleaning sheet, said method comprising the steps of:
producing a paint having air bubbles dispersed therein by mechanically foaming a foaming material comprising a foaming resin material and non-fibrous abrading particles;
forming on a base sheet a foamed layer having abrading particles dispersed therein by coating a surface of said base sheet with said paint and drying said paint; and
forming a polishing layer on a surface of said foamed layer.
3. The method of claim 2 wherein the step of producing said paint comprises the step of sending air into said foaming material while stirring said foaming material and thereby dispersing said air bubbles and said abrading particles inside said paint.
4. The method of claim 2 wherein the step of forming said polishing layer comprises the steps of:
applying a paint including a resin binder and said abrading particles on a surface of said foamed layer; and
drying said applied paint whereby said polishing layer is formed on the surface of said formed layer having said abrading particles dispersed therein.
5. A method of cleaning a probe, said probe having a tip, said method comprising the steps of:
preparing a cleaning sheet comprising a base sheet, a foamed layer formed on said base sheet, said foamed layer having non-fibrous abrading particles dispersed therein, and a polishing layer formed on said foamed layer;
causing a surface of said polishing layer to be pressed against said tip of said probe;
causing said tip to penetrate said polishing layer and to be thereby inserted into said foamed layer having said abrading particles dispersed therein.
6. The method of claim 5 wherein the step of preparing said cleaning sheet comprises the steps of:
producing a paint having air bubbles dispersed therein by mechanically foaming a foaming material comprising a foaming resin material and abrading particles;
forming on a base sheet a foamed layer having abrading particles dispersed therein by coating a surface of said base sheet with said paint and drying said paint; and
forming a polishing layer on a surface of said foamed layer.
7. The method of claim 6 wherein the step of producing said paint comprises the step of sending air into said foaming material while stirring said foaming material and thereby dispersing said air bubbles and said abrading particles inside said paint.
8. The method of claim 6 wherein the step of forming said polishing layer comprises the steps of:
applying a paint including a resin binder and said abrading particles on a surface of said foamed layer; and
drying said applied paint whereby said polishing layer is formed on the surface of said formed layer having said abrading particles dispersed therein.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/218,932 US20060030247A1 (en) | 2001-05-02 | 2005-09-02 | Cleaning sheet and method for a probe |
US11/732,193 US20070178814A1 (en) | 2001-05-02 | 2007-04-02 | Method of cleaning a probe |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001135090A JP2002326169A (en) | 2001-05-02 | 2001-05-02 | Contact cleaning sheet and method |
JP2001-135090 | 2001-05-02 | ||
PCT/JP2002/003335 WO2002090054A2 (en) | 2001-05-02 | 2002-04-03 | Contactor cleaning sheet, contactor cleaning sheet manufacturing method, and contactor cleaning method |
WOPCT/JP02/03335 | 2002-04-03 | ||
US10/298,310 US20030089384A1 (en) | 2001-05-02 | 2002-11-14 | Cleaning sheet and method for a probe |
US11/218,932 US20060030247A1 (en) | 2001-05-02 | 2005-09-02 | Cleaning sheet and method for a probe |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/298,310 Continuation-In-Part US20030089384A1 (en) | 2001-05-02 | 2002-11-14 | Cleaning sheet and method for a probe |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/732,193 Division US20070178814A1 (en) | 2001-05-02 | 2007-04-02 | Method of cleaning a probe |
Publications (1)
Publication Number | Publication Date |
---|---|
US20060030247A1 true US20060030247A1 (en) | 2006-02-09 |
Family
ID=18982630
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/298,310 Abandoned US20030089384A1 (en) | 2001-05-02 | 2002-11-14 | Cleaning sheet and method for a probe |
US11/218,932 Abandoned US20060030247A1 (en) | 2001-05-02 | 2005-09-02 | Cleaning sheet and method for a probe |
US11/732,193 Abandoned US20070178814A1 (en) | 2001-05-02 | 2007-04-02 | Method of cleaning a probe |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/298,310 Abandoned US20030089384A1 (en) | 2001-05-02 | 2002-11-14 | Cleaning sheet and method for a probe |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/732,193 Abandoned US20070178814A1 (en) | 2001-05-02 | 2007-04-02 | Method of cleaning a probe |
Country Status (6)
Country | Link |
---|---|
US (3) | US20030089384A1 (en) |
EP (1) | EP1552905A4 (en) |
JP (1) | JP2002326169A (en) |
KR (1) | KR100853589B1 (en) |
TW (1) | TW541234B (en) |
WO (1) | WO2002090054A2 (en) |
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US20080070481A1 (en) * | 2006-09-15 | 2008-03-20 | Nihon Micro Coating Co., Ltd. | Probe cleaner and cleaning method |
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Also Published As
Publication number | Publication date |
---|---|
EP1552905A4 (en) | 2008-05-28 |
KR20030016317A (en) | 2003-02-26 |
EP1552905A2 (en) | 2005-07-13 |
US20030089384A1 (en) | 2003-05-15 |
KR100853589B1 (en) | 2008-08-21 |
WO2002090054A2 (en) | 2002-11-14 |
TW541234B (en) | 2003-07-11 |
US20070178814A1 (en) | 2007-08-02 |
WO2002090054A3 (en) | 2005-05-19 |
JP2002326169A (en) | 2002-11-12 |
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Legal Events
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AS | Assignment |
Owner name: NIHON MICROCOATING CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SATO, SATORU;SAKAMOTO, AKIHIRO;REEL/FRAME:017165/0415 Effective date: 20051005 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |